Heteropolycopper niobate, preparation method thereof and application thereof in photocatalytic degradation of dye wastewater

A technology for dye wastewater and niobate, which is applied in the synthesis of polyniobate and the field of photocatalysis, and achieves the effects of good application prospect, low cost and simple synthesis process.

Inactive Publication Date: 2017-04-19
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above studies have enriched the structural chemistry of polyniobates, but so far, [XNb 12 o 40 ] n- (X is a heteroatom) in the Keggin type heteropolyniobate and its derivatives with the general formula, the heteroatom X is limited to the P block element P 5+ 、Si 4+ 、 Ge 4+ 、As 5+ , Sb 3+ and pre-transition zone metal V 5+ , and the polyniobate with Keggin structure in which the metal in the later transition zone is a heteroatom has not been reported

Method used

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  • Heteropolycopper niobate, preparation method thereof and application thereof in photocatalytic degradation of dye wastewater
  • Heteropolycopper niobate, preparation method thereof and application thereof in photocatalytic degradation of dye wastewater
  • Heteropolycopper niobate, preparation method thereof and application thereof in photocatalytic degradation of dye wastewater

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Experimental program
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Effect test

Embodiment 1

[0024] Preparation of Heteropolycopper Niobates

[0025] 1. Precursor K 8 [Nb 6 o 19 ]•17H 2 O was prepared according to the method reported in the literature (J. Am. Chem. Soc., 2012, 19716–19721);

[0026] 2. Stir and mix 5mL high-purity water and 10mL ethylene glycol to form a mixed solvent, then add 0.5mL ethylenediamine, 0.1g copper sulfate pentahydrate, and 0.3g precursor K to the mixed solvent in sequence 8 [Nb 6 o 19 ]•17H 2 0 and 0.2g sodium metavanadate, stir and mix to obtain mixed solution;

[0027] 3. Transfer the mixed solution to a hydrothermal reaction kettle, then place the hydrothermal reaction kettle in a programmable temperature-controlled oven, set the temperature parameters of the oven, raise the temperature from room temperature to 110°C in 1 hour, and keep the temperature at 110°C for 72 hours , and then lowered the temperature to 30°C in 48h, and finally obtained the target product dark purple massive crystal heteropolycopper niobate with a yie...

Embodiment 2

[0034] Photocatalytic degradation activity test

[0035] Add 50mL rhodamine B solution of a certain concentration to the quartz photocatalytic reaction tube, then add a certain quality of heteropolycopper niobate, adjust the pH value of the reaction system through dilute sulfuric acid and potassium hydroxide solution, and then start the photocatalytic reaction from the quartz A constant flow of air was introduced into the bottom of the tube, irradiated with a 300W mercury lamp for a certain period of time, 5mL of the sample liquid was taken, and after it was centrifuged, the supernatant liquid was taken, and the absorbance of the sample liquid at 554nm was measured with a UV-Vis spectrophotometer. Since the concentration of Rhodamine B has a linear relationship with its absorbance, the degradation rate of Rhodamine B can be calculated from the absorbance.

[0036] The effect of the amount of heteropolycopper niobate on the photocatalytic effect:

[0037] Adding 50mL mass conc...

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Abstract

The invention discloses heteropolycopper niobate, a preparation method thereof and application thereof in photocatalytic degradation of dye wastewater, and belongs to the technical field of synthesis and photocatalysis of polyniobate. The key points of the technical scheme are as follows: the molecular formula of the heteropolycopper niobate is H6[Cu(en)2]4[CuNb12O40(VO)2].7H2O; in a polyanion [CuNb12O40(VO)2]14, the bond length of the Cu-O bonds of central heteroatomic copper and surrounding oxygen atoms are 1.728A'; two V4+ cover caps are located at the two poles of the polyanion; in a cationic complex [Cu(en)2]2+, the bond length of the Cu-N bond is 2.022 A'; and each polyanion is respectively connected with four cationic complex through Cu-O(t) bonds. The invention also discloses a preparation method of the heteropolycopper niobate and application of the heteropolycopper niobate in the photocatalytic degradation of dye wastewater. The heteropolycopper niobate prepared in the invention is the first heteropoly niobate which regards late transition metal as a heteroatom, is simple in synthesis process and low in cost, is absorbed in a UV region and a visible light region, and has relatively good application prospect in the field of photocatalysis.

Description

technical field [0001] The invention belongs to the technical field of synthesis of polyniobate and its photocatalysis, and specifically relates to a heteropolycopper niobate, a preparation method thereof and an application in photocatalytic degradation of dye wastewater. Background technique [0002] In recent years, while people are pursuing a comfortable and convenient life and vigorously developing industrial production, they have also lost the "green water and green mountains" endowed by nature, resulting in pollutants everywhere, and even affecting people's health. Therefore, the development of new energy sources and the degradation of pollutants have become urgent problems to be solved. Developing effective photocatalysts and developing photocatalytic technology is one of the effective ways to solve the current energy and environmental problems that people are facing. [0003] Due to their potential applications in photocatalytic hydrogen production and photocatalyti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/847C02F1/30C02F1/72C02F101/30
CPCB01J23/002B01J23/8474B01J35/004B01J2523/00C02F1/30C02F1/725C02F2101/308B01J2523/17B01J2523/55B01J2523/56
Inventor 李书军汲盼盼王偌雅翟建新陈学年
Owner HENAN NORMAL UNIV
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